Bug 339507

In the Eclipse 4.4.1 IDE, if I attempt to view the Java Build Path configuration page (Window>Preferences>Java>Build Path) while using the Oxygen GTK2 theme on my Kubuntu x86_64 computer, Eclipse will crash with the message "java: /build/buildd/gtk2-engines-oxygen-1.4.5/src/animations/oxygencomboboxdata.cpp:87: void Oxygen::ComboBoxData::setButton(GtkWidget*): Assertion `!_button._widget' failed.".  I reported the bug to Eclipse at https://bugs.eclipse.org/bugs/show_bug.cgi?id=445220, but they seem to think it is a bug in the Oxygen GTK2 theme, so I will report it here too.

Reproducible: Always

Steps to Reproduce:
1. Set the GTK2 theme to Oxygen
2. Start Eclipse 4.4.1
3. Access the Java Build Path configuration page (Window>Preferences>Java>Build Path)

Actual Results:  
Eclipse crashes with the error message described above

Expected Results:  
Eclipse does not crash and displays the configuration page correctly